Being Photographed or Filmed by Park promotional staff

I was at Knotts Berry Farm this weekend with my family. There was an Easter activity where kids can hunt for clues and then turn in the card and collect a small prize. I noticed there was a (presumably) park employee standing there with a large video camera shooting video of our kids looking at the prize bucket, picking out a prize, and then opening the plastic egg and looking at the candies inside. The video guy got there with a park manager right before we got there, and went somewhere else after filming our kids.

I started to have second thoughts about our kids showing up in a Knott's commercial or web video later on. I looked at our tickets and saw the legal wording on the back which said the park had the right to take photos or video of guests by virtue of the guest entering the park.

Here are my questions:1. Is this common practice among amusement/theme parks? Does anyone know of any cases where someone or their kids was photographed and later used in promotional material, and got into a dispute with the park over it?

2. Unless the photographer was filming a large group, wouldn't it be common courtesy to make sure it was okay with the park guest before filming?

Thanks for your thoughts and feedback.

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